Probing cosmology with astrophysical gravitational wave background

用天体物理引力波背景探测宇宙学

基本信息

批准号：
20K22348
负责人：
Vardanyan Valeri
金额：
$ 1.75万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Research Activity Start-up
财政年份：
2020
资助国家：
日本
起止时间：
2020-09-11 至 2024-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20K22348/
关键词：
Cosmology Gravitational Waves Primordial black holes Cross-Correlations Multimessenger astronomy Primordial GW Large-scale Structure Large Scale Strcuture Gaussian Processes Cross Correlation

项目摘要

The original goals of the research proposal have been already achieved. During the past 12 months I have worked on extensions of the proposed projects. I have completed a paper studying anisotropic gravitational-wave background originating from primordial black-hole binaries formed in the early universe, and have assessed the prospects of distinguishing the primordial and astrophysical origins of gravitational-wave binaries. Additionally, I have continued working on modeling the cross-correlations between resolved gravitation-wave sources and galaxies with the aim of testing gravity at cosmological scales, as well as establishing the origin of gravitational-wave binaries via measuring the linear bias of their spatial clustering.In addition to the main theme of the KAKENHI project, I have also worked on projects of indirect relevance to the main theme. Particularly, I have completed a paper exploring the prospects of generating magnetic fields in the early universe. The studied scenario is also relevant for gravitation-wave generation, and is of interest for future gravitational-wave experiments. I have also released a paper discussing possible tests of fundamental physics using GRBs, and have studied extensions of the LCDM model.I have completed research visits during which I have delivered invited talks based on the obtained results, as detailed at later sections of this report.

研究建议的最初目标已经实现。在过去的12个月中，我研究了拟议项目的扩展。我已经完成了一篇论文，研究了各向异性引力波背景，该论文源自早期宇宙中形成的原始黑洞二进制文件，并评估了区分重力波二进制的原始和天体物理起源的前景。此外，我继续致力于建模分析的重力波源和星系之间的互相关，以便在宇宙学量表上测试引力，并通过测量其空间集群的线性偏置来确定引力波的起源。特别是，我已经完成了一篇论文，探讨了早期宇宙中产生磁场的前景。研究的方案也与重力波的产生有关，并且对将来的重力波实验感兴趣。我还发布了一篇论文，讨论了使用GRB的基本物理学测试，并研究了LCDM模型的扩展。我已经完成了研究访问，在此期间，我根据所获得的结果进行了邀请的演讲，如本报告的后面部分所述。